Since this is an Extraordinary session, it seems the rules are fluid.

The original idea was that this session would take the results of the survey that was sent to the dioceses and other pressing issues, discuss them and distill them into a “short list” of pressing issues related to the theme of “The Family” and bring that short list to the ordinary session of the Synod in 2015 right after the World Meeting of Families. The “voting” was supposed to decide what issues were forwarded from the extraordinary preliminary session to the ordinary 2015 session.
That was the ideal. It seems, from an outsider’s perspective, that it turned into something more like a political convention deciding on party platforms. (under the guidance of the Holy Spirit, of course) It’s hard to tell since the media that reports all of this is much more familiar with party politics than the workings of the Holy Spirit.